September weather forecastKeyesville, CA
September
Weather in September
September, the first month of the autumn in Keyesville, is still a warm month, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 79.3°F (26.3°C).Temperature
In Keyesville, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's 85.3°F (29.6°C) to a still warm 79.3°F (26.3°C). A marked difference from the daytime temperatures, Keyesville's nighttime temperature falls to an average low of 54.5°F (12.5°C) in September.Humidity
The average relative humidity in September is 35%.Rainfall
In Keyesville, in September, it is raining for 3.4 days, with typically 0.24" (6mm) of accumulated precipitation. In Keyesville, during the entire year, the rain falls for 65.1 days and collects up to 12.28" (312mm) of precipitation.Snowfall
In Keyesville, California, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:20 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:38 pm PDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In Keyesville, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Keyesville, CA
- Average high temperature in September: 79.3°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is December (49.3°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (32.4°F).
Average pressure in September
Keyesville, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Keyesville, CA
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is September (5.4mph).
Average humidity in September
Keyesville, CA
- Average humidity in September: 35%
The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is August (31%).
Average rainfall in September
Keyesville, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is January (2.24").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in September
Keyesville, CA
- Average rainfall days in September: 3.4 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is June (1.5 days).
Average snowfall in September
Keyesville, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.98").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Keyesville, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Keyesville, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 10h and 54min
The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 6h and 24min).
Average sunshine days in September
Keyesville, CA
- Average sunshine days in September: 25.9 days
The month with the most sunshine days is June (27.4 days).
The month with the least sunshine days is February (19.2 days).
Average UV index in September
Keyesville, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in September
Keyesville, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 31).
The months with the least cloud cover are August and September (Cloud cover 6).
Average visibility in September
Keyesville, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
